Drill-jar



H. F. SBYBERT.

DRILL IAR.

(N 'o Model.)

Patented 001;. 19, 1897.

/NVENTH Ma By 7M ATTORNEY.

' UNITEDl STATES PATENT OFFICE.

HARVEY E. sEYBERT, oE QUEENsTowN, PENNSYLVANIA.

DRILL-JAR.

i SPECIFICATION forming part of Letters Patent No. 592,024, datedOctober19, 1897.

Application tiled July 2, 1897. Serial No. 643,257. (No model.)

.To @ZZ whom it may concern:

Be it known that I, HARVEY F. SEYBEET, a citizen of the United States,residing at Queenstown, in the county of Armstrong and State ofPennsylvania, have invented certain new and useful Improvements inDrill-J ars; and I do declare the following to be a full,

clear, and exact description ofthe invention, such as will enable othersskilled inthe art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification. f

The special object of the invention is to make a drill-jar withspring-tension, so that with the longitudinal Slots a a', while Erepresents the member to the upper en d of which the lifting-rope isattached in the usual'way. The drill holder or member A receives in theslot a the plate-spring C, bent alternately in and out or zigzag, sothat the openings between the folds will altern ate therewith. The

rope section or member B has a slot b, so that it may interlock with themember A by means of the slot a, and cause them to be at right angles toeach other. The length of the slots a b limit their movement upon oneanother. On the lower end of the rope section B are pivoted the upperends of two arms D D, working on the outside of slot a and having attheir lower ends the screws d d, end-threaded to receive the nuts d d. Dis an abutment which ts loosely over the threads of the screws.` Thus itwill be seen that the straining-spring C is held laterally between thearms D D, and vertically between the abutment D and the upper wall ofslot a', Ithe tension of the spring being regulated by the nuts d.

What I claim as new is- In a drill-jar the combination of the twoslotted interlocking members A B, the spring C, the arms D D, theabutment D', the screws d, and nuts d all arranged substantially asshown and described,for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

HARVEY E. sEYBEET.

Witnesses:

W. H. KAENs, MARION ELDER.

